As of Thursday i have a sound system in my car. Ill give u the details then ill let u know my problem.. Stock HU - 6 stacker mp3... Pioneer 2ways at the front with the stock tweeter, Pioneer 10"sub and a clarion mono and 2ch. Running hi-lo converters from each amp. Was happy with it, u know, pro installed and all When i pump the music loud, it sounds excellent, as good as it can. But if u listen carefully, high or low volume u can hear a static sort of sound. It doesnt stop. At first i was thinking, oh its the quality of the cd i put it. It was burnt so i assumed that was it. Then i put in an original cd, same trouble.... hmm. Radio is the same, fm/am, same deal. Had a think about it, thinking there is some form of interference, maybe a noise filter is needed. Suppressor perhaps.. ?? What do u guys think, anyone had the same problem.. Another problem, when i turn the deck off, to use the fone or whatever, theres a clicking sound.. with the key in the ignition or even just on acc. So yea.. bit of a drama.. Thanks